CHAPTER12Asynchronous Services with SOA Composites and Service Bus
“Let me write down your number and get back to you” can be much more efficient than “please hold the line.” The former is a typical example of asynchronous communication. This can be much more efficient than actually holding the line, which is the synchronous way of conversing. While holding the line, waiting for a response, you are blocked—unable to engage in useful activities.
In real life, when you tell something to a person, you don’t mind waiting for answer (beyond some form of acknowledgement that your message was heard and understood) if and when:
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